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INVESTMENTS (Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost, Total | $ 917,064 | $ 673,003
Available-for-sale securities, at fair value (amortized cost of $917,064 and $673,003, respectively) | 860,217 | 593,749
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost, Total | 5,421 | 5,423
Unrealized Gains | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 92 | 134
Available-for-sale securities, at fair value (amortized cost of $917,064 and $673,003, respectively) | 5,329 | 5,289
MBS issued or guaranteed by U.S. government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost, Total | 687,078 | 493,766
Unrealized Gains | 3,886 | 353
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 52,947 | 69,163
Available-for-sale securities, at fair value (amortized cost of $917,064 and $673,003, respectively) | 638,017 | 424,956
CMO issued or guaranteed by U.S. government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost, Total | 206,863 | 156,131
Unrealized Gains | 1,019 | 502
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 7,663 | 9,154
Available-for-sale securities, at fair value (amortized cost of $917,064 and $673,003, respectively) | 200,219 | 147,479
Subordinated corporate bonds |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost, Total | 17,702 | 17,683
Unrealized Gains | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 1,050 | 1,658
Available-for-sale securities, at fair value (amortized cost of $917,064 and $673,003, respectively) | 16,652 | 16,025
Total AFS debt securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost, Total | 917,064 | 673,003
Unrealized Gains | 4,905 | 855
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 61,752 | 80,109
Available-for-sale securities, at fair value (amortized cost of $917,064 and $673,003, respectively) | $ 860,217 | $ 593,749

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